Horizontal hydraulic jack

Abstract

The utility model relates to the technical field of jack manufacturing, especially a horizontal hydraulic jack. The rack is used as a bearing base, the lifting arm is hinged to the rack through the middle shaft to realize rotatable connection, the front end of the connecting rod arm is hinged to the lifting arm through the front hinge shaft, the rear end is hinged to the rack through the rear hinge shaft, and a stable transmission structure is formed. The oil cylinder is used as a power component, and when working, the lifting arm is pushed upward to rotate around the middle shaft as a fulcrum, and at the same time, the lifting arm drives the connecting rod arm to rotate around the rear hinge shaft as a fulcrum synchronously, so that the jacking operation is realized. The structure reinforcing plate is attached to one side of the rack, and during installation, the middle shaft and the rear hinge shaft are used to realize accurate positioning, and after positioning is completed, the structure reinforcing plate is firmly combined with the rack through the fixing unit to form an integrated whole. In this way, the positioning accuracy of the structure reinforcing plate and the rack is ensured by using the original components, the stress concentration problem caused by positioning deviation is effectively avoided, the assembly process is simplified, and the structural strength of the rack and the overall carrying capacity of the equipment are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of jack manufacturing technology, and in particular to a horizontal hydraulic jack. Background Technology

[0002] In the application scenarios of horizontal hydraulic jacks, whether it's supporting work during vehicle maintenance or lifting heavy objects, the frame, as the core load-bearing component directly in contact with the ground, constantly bears the enormous load and torque transmitted from the superstructure. Currently, the frames of mainstream horizontal hydraulic jacks generally adopt a single-plate stamped structure. While this can meet the foundation's load-bearing requirements, under long-term, high-frequency, high-load operation, weak areas of the plate are prone to gradual plastic deformation due to stress concentration, and in severe cases, even through-cracks may occur. This not only directly leads to a decrease in the jack's lifting accuracy and significantly shortens the overall service life of the equipment, but in serious cases, it can even threaten operational safety.

[0003] To improve this situation, some manufacturers have attempted to add structural reinforcing plates to both sides of the frame to enhance its resistance to deformation. However, existing installation and positioning schemes for structural reinforcing plates still have significant technical shortcomings: First, the positioning process relies excessively on additional positioning pins or special auxiliary tooling, which not only increases manufacturing costs but also prolongs assembly line operation time; second, because the positioning reference of the reinforcing plate is independent of the frame's own assembly reference (such as the mounting holes of the central shaft and hinge shaft), it is very easy for cumulative errors to cause deviations in the relative position of the reinforcing plate and the frame. When the equipment is under stress, the positioning deviation will prevent the reinforcing plate from forming a uniform stress distribution with the frame, instead creating new stress concentration points at the connection points. This not only weakens the overall reinforcement effect but may even cause secondary failures such as loosening or breaking of the connecting bolts between the reinforcing plate and the frame.

[0004] Therefore, simplifying the installation and positioning structure of the structural reinforcement plate while ensuring its positioning accuracy with the frame has become a key issue in improving the structural reliability of horizontal hydraulic jacks. Utility Model Content

[0005] The purpose of this invention is to provide a horizontal hydraulic jack that addresses the problems of existing designs, such as reliance on additional components, complex procedures, and insufficient positioning accuracy in installing structural reinforcement plates.

[0006] This utility model relates to a horizontal hydraulic jack, including a frame, a lifting arm, a hydraulic cylinder, a connecting rod arm, a central shaft, a front hinge shaft, and a rear hinge shaft. The lifting arm is hinged to the frame via the central shaft. The front end of the connecting rod arm is hinged to the lifting arm via the front hinge shaft, and its rear end is hinged to the frame via the rear hinge shaft. When the hydraulic cylinder works, it pushes the lifting arm to rotate upwards around the central shaft, and the lifting arm drives the connecting rod arm to rotate around the rear hinge shaft via the front hinge shaft. The horizontal hydraulic jack also includes a structural reinforcing plate and a fixing unit. The structural reinforcing plate is attached to one side of the frame, and its installation and positioning are achieved using the central shaft and the rear hinge shaft. After the structural reinforcing plate is positioned, it is integrated with the frame by the fixing unit.

[0007] As a further improvement to the technical solution disclosed in this utility model, the structural reinforcing plate is formed with a main positioning hole adapted to the central axis and an auxiliary positioning hole adapted to the rear hinge shaft. The main positioning hole and the auxiliary positioning hole cooperate to achieve the initial installation and positioning of the structural reinforcing plate.

[0008] As a further improvement to the technical solution disclosed in this utility model, the fit tolerance between the main positioning base hole and the central shaft, and between the auxiliary positioning base hole and the rear hinge shaft, is preferably H7 / h6.

[0009] As a further improvement to the technical solution disclosed in this utility model, the horizontal hydraulic jack also includes a rear-mounted nut washer assembly. The rear-mounted nut washer assembly forms a threaded pair with the exposed section of the central shaft and abuts against the side of the structural reinforcing plate opposite to the frame.

[0010] As a further improvement to the technical solution disclosed in this utility model, the horizontal hydraulic jack also includes a front-mounted nut washer assembly. The front-mounted nut washer assembly forms a threaded pair with the exposed section of the rear-mounted hinge shaft, and abuts against the side of the structural reinforcing plate opposite to the frame.

[0011] As a further improvement to the technical solution disclosed in this utility model, the fixing unit is composed of multiple screws. The screws pass through the structural reinforcing plate and form a threaded pair with the frame, and are distributed in a distributed manner to evenly transmit the locking force to the structural reinforcing plate.

[0012] As a further improvement to the technical solution disclosed in this utility model, the structural reinforcing plate is also provided with a handle. The handle is a hollow area that penetrates through the structural reinforcing plate, and is opened along the edge contour of the structural reinforcing plate and slopes outward.

[0013] As a further improvement to the technical solution disclosed in this utility model, the area of ​​the handle portion accounts for 15-30% of the surface area of ​​the structural reinforcement plate, and the outward tilt angle is 15-45°, thereby optimizing the orientation of the handle portion and improving the rigidity of the structural reinforcement plate.

[0014] In practical applications, the horizontal hydraulic jack disclosed in this utility model can achieve at least the following beneficial technical effects, specifically:

[0015] 1) By using the central shaft and rear hinge shaft to achieve the installation and positioning of the structural reinforcement plate, there is no need to add additional positioning pins or auxiliary tooling. This reduces the number of parts, lowers production and assembly costs, and utilizes the precise assembly benchmark of the original equipment components to ensure the relative position accuracy of the structural reinforcement plate and the frame. This effectively avoids stress concentration problems caused by positioning deviations and significantly improves the overall structural strength and stability of the frame.

[0016] 2) The structural reinforcement plate is attached to one side of the frame. It is first quickly positioned using the central shaft and rear hinge shaft, and then firmly integrated into one unit by the fixing unit. This simplifies the installation steps and shortens the assembly time. In this way, not only is the function of the existing components fully utilized, but the load-bearing capacity and service life of the horizontal hydraulic jack are also enhanced without significantly increasing the size and weight of the equipment. It can also better adapt to the needs of high-intensity and high-frequency operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the horizontal hydraulic jack disclosed in this utility model.

[0019] Figure 2 yes Figure 1 Top view.

[0020] Figure 3 This is an exploded schematic diagram of the horizontal hydraulic jack disclosed in this utility model.

[0021] Figure 4 This is a three-dimensional schematic diagram of the structural reinforcement plate in the horizontal hydraulic jack disclosed in this utility model.

[0022] 1-Frame; 2-Lifting boom; 3-Linkage arm; 4-Central shaft; 5-Front hinge shaft; 6-Rear hinge shaft; 7-Structural reinforcing plate; 71-Main positioning base hole; 72-Auxiliary positioning base hole; 73-Mounting through hole; 74-Handle; 8-Fixing unit; 81-Screw; 9-Rear nut washer assembly; 10-Front nut washer assembly. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments, such as... Figures 1-3 As shown in the diagram, the horizontal hydraulic jack mainly consists of a frame 1, a lifting arm 2, a hydraulic cylinder, a connecting rod arm 3, a central shaft 4, a front hinge shaft 5, a rear hinge shaft 6, a structural reinforcement plate 7, and a fixing unit 8. The lifting arm 2 is hinged to the frame 1 via the central shaft 4, forming a rotatable fulcrum structure. The connecting rod arm 3 is a long, strip-shaped plate; its front end is hinged to the lifting arm 2 via the front hinge shaft 5, and its rear end is hinged to the frame 1 via the rear hinge shaft 6. This allows the connecting rod arm 3, the lifting arm 2, and the frame 1 to form a triangular transmission structure, ensuring the stability of force transmission. The hydraulic cylinder is horizontally installed in the front groove of the frame 1, with its tail section hinged and fixed to the frame 1. The piston rod end is connected to the lifting arm 2 (not shown in the diagram). When high-pressure hydraulic oil is introduced into the cylinder, the piston rod extends axially, pushing the lifting arm 2 to rotate upward around the central shaft 4. At the same time, the lifting arm 2 drives the connecting rod arm 3 to rotate synchronously around the rear hinge shaft 6 through the front hinge shaft 5, thereby realizing the lifting action of the jack.

[0024] Depend on Figure 1 , Figure 2 As can be clearly seen in the diagram, structural reinforcing plates 7 are attached to both the front and rear side walls of the frame 1. Here, we will only illustrate this with an example of the structural reinforcing plate 7 attached to the front side wall. Figure 4 As shown, the structural reinforcement plate 7 is provided with a main positioning hole 81 that matches the central shaft 4 and an auxiliary positioning hole 82 that matches the rear hinge shaft 6.

[0025] During installation, the main positioning hole 81 is first fitted into the exposed section of the central shaft 4, and the auxiliary positioning hole 82 is fitted into the end of the rear hinge shaft 6. With the axial positioning effect of the central shaft 4 and the rear hinge shaft 6, the structural reinforcement plate 7 and the frame 1 can be initially aligned. In the above installation process, no additional positioning pins or auxiliary tooling are required, which not only reduces the number of parts and lowers production and assembly costs, but also utilizes the precise assembly benchmarks of the original equipment components to ensure the accurate relative position between the structural reinforcement plate 7 and the frame 1. This effectively avoids stress concentration problems caused by positioning deviations, significantly improves the overall structural strength and stability of the frame 1, and lays a good foundation for the subsequent fastening of the fixing unit 8.

[0026] The structural reinforcement plate 7 is attached to one side of the frame 1, and is first quickly positioned by the central shaft 4 and the rear hinge shaft 6, and then firmly integrated into one unit by the fixing unit 8. Figure 3 As shown, the fixing unit 8 preferably consists of multiple evenly distributed cross screws 81, arranged along the edge of the structural reinforcing plate 7. Figure 4As shown, the structural reinforcing plate 7 also has mounting through holes 73 for cross-head screws 81 to pass through. During the installation process of the structural reinforcing plate 7, after the cross-head screws 81 pass through the mounting through holes 73, they form a threaded pair with the threaded holes of the frame 1. After tightening, the structural reinforcing plate 7 can be tightly pressed onto the frame 1, so that the two deform synchronously when subjected to force, avoiding relative displacement. In this way, not only is the function of existing components fully utilized, but the load-bearing capacity and service life of the horizontal hydraulic jack are enhanced without significantly increasing the size and weight of the equipment, and it can also adapt to the needs of high-intensity and high-frequency operations.

[0027] Furthermore, by Figure 1 , Figure 2 , Figure 3 As shown, the rear nut washer assembly 9 and the front nut washer assembly 10 are respectively fastened to the ends of the central shaft 4 and the rear hinge shaft 6 by threaded connection, so as to realize the axial positioning of the central shaft 4 and the rear hinge shaft 6, and also serve as the function of lateral pressing structure reinforcement plate 7.

[0028] The rear nut washer assembly 9 consists of a rear nut and a rear washer, while the front nut washer assembly 10 consists of a front nut and a front washer. During installation, the rear washer is first fitted onto the central shaft, and then the rear nut is tightened, ensuring the rear washer fits tightly against the outer wall of the structural reinforcement plate. The preload of the rear nut further enhances the tightness between the structural reinforcement plate 7 and the frame 1. Similarly, the front washer 112 is fitted onto the rear hinge shaft 6, and the front nut is tightened, pressing the front washer firmly against the structural reinforcement plate 7. Together with the rear nut washer assembly 9, this ensures that the structural reinforcement plate 7 will not loosen or shift under stress.

[0029] It is worth noting that both the rear and front gaskets should be made of high-strength elastic materials. When subjected to the preload of the nut, they will undergo a certain elastic deformation, thereby effectively buffering the vibration and impact generated during the operation of the jack and preventing the nut from loosening due to long-term vibration.

[0030] Of course, as another modified design of the above technical solution, the rear nut washer assembly 9 and the front nut washer assembly 10 can be replaced by snap rings. In this case, the exposed sections of the central shaft 4 and the rear hinge shaft 6 need to be provided with annular limiting grooves for the snap rings to be installed.

[0031] As a preferred design, the fit tolerances between the main positioning base hole 71 and the central shaft 4, and between the auxiliary positioning base hole 72 and the rear hinge shaft 6, are preferably H7 / h6. H7 / h6 is a clearance fit, meaning the tolerance zone of the hole is H7 (lower deviation is 0, upper deviation is determined according to the basic dimensions), and the tolerance zone of the shaft is h6 (upper deviation is 0, lower deviation is a negative tolerance value). This ensures a reasonable clearance between the shaft and the hole. On the one hand, this facilitates the smooth insertion of the structural reinforcing plate 7 into the central shaft 4 and the rear hinge shaft 6 during installation, enabling rapid initial positioning. On the other hand, it avoids insufficient positioning accuracy due to excessive clearance, ensuring accurate relative positioning between the structural reinforcing plate 7 and the frame 1, laying a good foundation for the subsequent fastening of the fixing unit 8.

[0032] Furthermore, by Figure 4 As clearly shown in the diagram, the structural reinforcing plate 7 is provided with a handle 74, which is an approximately rectangular hollow area penetrating the structural reinforcing plate 7, with its outline edges rounded. The handle 74 is located along one edge near the rear end of the frame 1, occupying 15-30% of the surface area of ​​the structural reinforcing plate 7, and is inclined outward at 15-45° relative to the plate surface of the structural reinforcing plate 7. When it is necessary to move or lift the jack, the operator can directly reach into the handle 74 and easily complete the lifting or moving operation of the equipment by utilizing the force application space created by its outward inclination angle. This advantage is particularly evident in narrow working environments. Thus, on the one hand, the 15-30% hollow area ensures sufficient hand space for gripping while avoiding weakening the overall strength of the structural reinforcing plate 7 due to an excessively large hollow area; on the other hand, the rounded edges of the handle 74 prevent the operator from being scratched by sharp edges.

[0033] It is worth noting that the handle 74 is inclined outward relative to the plate surface to form a bent structure. The bending treatment can further enhance the overall rigidity of the structural reinforcement plate 7. That is, by changing the stress form of the plate, the local stress is dispersed to a larger area, thereby significantly improving the reinforcement effect on the frame 1, ensuring that the frame 1 can withstand pressure more stably, and ensuring the overall operational safety and reliability of the horizontal hydraulic jack.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A horizontal hydraulic jack, comprising a frame, a lifting arm, a hydraulic cylinder, a connecting rod arm, a central shaft, a front hinge shaft, and a rear hinge shaft; the lifting arm is hinged to the frame via the central shaft; the front end of the connecting rod arm is hinged to the lifting arm via the front hinge shaft, and its rear end is hinged to the frame via the rear hinge shaft; when the hydraulic cylinder performs work, it pushes the lifting arm to rotate upward about the central shaft, and the lifting arm drives the connecting rod arm to rotate about the rear hinge shaft via the front hinge shaft, characterized in that... It also includes a structural reinforcing plate and a fixing unit; the structural reinforcing plate is attached to one side of the frame, and its installation and positioning are achieved by means of the central shaft and the rear hinge shaft; after the structural reinforcing plate is positioned, it is combined with the frame by means of the fixing unit.

2. The horizontal hydraulic jack according to claim 1, characterized in that, The structural reinforcement plate is formed with a main positioning base hole adapted to the central axis and an auxiliary positioning base hole adapted to the rear hinge shaft; the main positioning base hole and the auxiliary positioning base hole cooperate to achieve the initial installation and positioning of the structural reinforcement plate.

3. The horizontal hydraulic jack according to claim 2, characterized in that, The fit tolerance between the main positioning base hole and the central shaft, and between the auxiliary positioning base hole and the rear hinge shaft, is H7 / h6.

4. The horizontal hydraulic jack according to claim 1, characterized in that, It also includes a rear nut washer assembly; the rear nut washer assembly forms a threaded pair with the exposed section of the central shaft and abuts against the side of the structural reinforcement plate away from the frame.

5. The horizontal hydraulic jack according to claim 1, characterized in that, It also includes a front nut washer assembly; the front nut washer assembly forms a threaded pair with the exposed section of the rear hinge shaft and abuts against the side of the structural reinforcement plate away from the frame.

6. The horizontal hydraulic jack according to claim 1, characterized in that, The fixing unit consists of multiple screws; the screws pass through the structural reinforcing plate and form a threaded pair with the frame, and are distributed in a distributed manner to evenly transmit the locking force to the structural reinforcing plate.

7. The horizontal hydraulic jack according to any one of claims 1-6, characterized in that, The structural reinforcement plate is also provided with a handle; the handle is a hollow area that penetrates the structural reinforcement plate, and is opened along the edge contour of the structural reinforcement plate and sloping outward.

8. The horizontal hydraulic jack according to claim 7, characterized in that, The handle portion accounts for 15-30% of the surface area of ​​the structural reinforcement plate, and the outward tilt angle is 15-45°, thereby optimizing the orientation of the handle portion and improving the rigidity of the structural reinforcement plate.

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